The Fifth Race.
O'Neill is not impressed and wants to return back through the gate.
Daniel and the rest of the SG-1 team have travelled to
a dark room that houses alien inscriptions.
Teal'c looks through a hole in the wall and sees only lights,
however when O'Neill looks the through the viewer, in this mysterious
ancient room, he is caught around the head, and exposed to a beam of light.
He seems ok, but he starts to use an ancient language, just the odd
word here and there, but after a while he loses the ability to speak english,
his whole being is now of the ancient ones.
Daniel is certain that O'Neill now possesses the Ancients knowledge, and
this race were the ones who invented the Stargates. It is killing O'Neill.
In an attempt to save himself, O'Neill must seek out these people with
a greater knowledge, in order to survive.